import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from '../components/Login'
import Home from '../components/Home'

Vue.use(VueRouter)

const routes = [
  {
    path: '/',
    redirect: '/login'
  },
  {
    path: '/login',
    component: Login
  }, {
    path: '/home',
    component: Home
  }]

const router = new VueRouter({
  routes
})

// 挂载路由导航守卫,防止用户在没有登录的情况下访问首页
router.beforeEach((to, from, next) => {
  // to:将要访问的路径
  // from:代表从那个路径跳转而来
  // next:是一个函数，表示放行 next('/') 强制跳转
  if (to.path === '/login') return next()
  // 获取token
  const tokenStr = window.sessionStorage.getItem('token')
  if (!tokenStr) return next('.login')
  next()
})
export default router
